Goofs for
Decoy (1946) More at IMDbPro »

• Crew or equipment visible: Right at the beginning, when Dr Craig's reflection is seen on the mirror, the dark line behind him is a shadow from either the camera or a boom mic, as it moves when the camera pulls away.
  
  
• Revealing mistakes: When Dr. Craig, Margot, and Jim are stopped police road block on a lonely dark road, and they leave a cut back to the inside of the car, it reveals through the back window they are still in the well lit city, with no road block behind them.
  
  
• Boom mic visible: As the camera dollies up on Sgt. Portugal as he reads the note taken from the money box, you can clearly she the shadow of the boom microphone go across his face.
  
  

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